igneous
Granite pebble
Granite; chiefly quartz, feldspar, and mica (variable composition)
AI-generated identification · may be incorrectCoarse, speckled gray-brown texture with visible interlocking grains; typically Mohs 6–7, vitreous quartz luster, no consistent cleavage as a whole, and specific gravity about 2.63–2.75.
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Physical properties
Coarse, speckled gray-brown texture with visible interlocking grains; typically Mohs 6–7, vitreous quartz luster, no consistent cleavage as a whole, and specific gravity about 2.63–2.75.
Formation & geological history
An intrusive igneous rock formed by slow cooling of silica-rich magma deep in the crust, commonly during Precambrian to Phanerozoic mountain-building events; this rounded specimen was likely transported and weathered naturally.
Uses & applications
Widely used for countertops, buildings, monuments, paving, aggregate, and landscaping; small pieces have modest educational or collector value.
Geological facts
Its grain size reflects slow underground cooling, while the rounded shape indicates abrasion during transport by water, ice, or sediment movement.
Field identification & locations
Identify granite by its visibly interlocking quartz, feldspar, and dark mica grains and lack of layering or fossils; common worldwide, especially in continental mountain belts.
